confine/*.lua: debug iteration time and speedup tree.filter processing
confine/*.lua: speedup tree.iterate processing. But no significant gain :-(
confine/*.lua: speedup assertions in tree.iterate processing. marginal impact
confine/*.lua: speedup assertions in tree.get_path_val processing. 60 times faster
vct update: VCT_NODE_TEMPLATE_URL=http://media.confine-project.eu/vct/openwrt-x86-generic-combined-ext4-bare-bones_11-x86.img.gz